Subsurface Definition

sŭbsûrfəs, sŭb-sûr-
sub-surface
adjective
Lying below the surface, esp. of the earth, the oceans, etc.
Webster's New World
Antonyms:
noun
A subsurface part.
Webster's New World

Something that is below the layer that is on the surface.

Before we could lay the flooring we had to lay a subsurface under it to keep it flat and supoort it.
Wiktionary

(countable, mathematics) A surface which is a submanifold of another surface.

Wiktionary

Other Word Forms of Subsurface

Noun

Singular:
subsurface
Plural:
subsurfaces

Origin of Subsurface

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Unscrambles

subsurface